Sian Ka’an is a biosphere reserve in the town ofTulum, Quintana Roo, Mexiko. It became aUNESCOWeltkulturerbe im 1987. Part of the reserve is on land and part is in the Caribbean Sea, including a section of coral reef. The reserve offers protection for the endangered species in the Riviera Maya and provides environmental education to the local communities to assist and train the residents working with ecotourism.

Cenote Dos Ojos is a flooded cave system located north of Tulum on the Caribbean Coast on the Yucatan Peninsula Quintana Roo, Mexiko. It is known officially as Sistema Dos Ojos. Cenotes is the local name for the sinkhole entrances. The cave system encompases 51 miles and is still being explored. The name Dos Ojos refers to two large cenotes that resemble two large eyes into the underground.